1) 3 1/8 : ( х - 4 7/24 ) =

1) 3 1/8 : (х - 4 7/24) = 17/18 + 1 5/6;

25/8 : (х - 103/24) = 17/18 + 11/6;

25/8 : (х - 103/24) = (17 * 1 + 11 * 3)/18;

25/8 : (х - 103/24) = (17 + 33)/18;

25/8 : (х - 103/24) = 50/18;

х - 103/24 = 25/8 : 50/18;

х - 103/24 = 25/8 * 18/50;

х - 103/24 = 1/4 * 9/2;

х - 103/24 = 9/8;

х = 9/8 + 103/24;

х = (9 * 3 + 103 * 1)/24;

х = (27 + 103)/24;

х = 130/24;

х = 65/12;

х = 5 5/12.

Ответ: 5 5/12. 

2) (4 1/5 : х + 1 1/3) : 2 4/35 - 4/5 = 1 8/15;

(21/5 : х + 4/3) : 74/35 - 4/5 = 23/15;

(21/5 : х + 4/3) : 74/35 = 23/15 + 4/5;

(21/5 : х + 4/3) : 74/35 = (23 * 1 + 4 * 3)/15;

(21/5 : х + 4/3) : 74/35 = (23 + 12)/15;

(21/5 : х + 4/3) : 74/35 = 35/15;

(21/5 : х + 4/3) : 74/35 = 7/3;

21/5 : х + 4/3 = 7/3 * 74/35;

21/5 : х + 4/3 = 1/3 * 74/5;

21/5 : х + 4/3 = 74/15;

21/5 : х = 74/15 - 4/3;

21/5 : х = (74 * 1 - 4 * 5)/15;

21/5 : х = (74 - 20)/15;

21/5 : х = 54/15;

х = 21/5 : 54/15;

х = 21/5 * 15/54;

х = 7/1 * 1/6;

х = 7/6;

х = 1 1/6.

Ответ: 1 1/6.